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To maximize the life of your Rolls AGM battery, it is important that it is properly charged. Bulk stage - the charger should deliver the initial current I1 until the voltage limit U0 is reached. Absorption stage - the charger should maintain the voltage U0 until the current tapers to I2. Float stage and termination – the charger can maintain the current I1 indefinitely or until the charger is shut off or unplugged.
Constant Current Charger - IUIA constant current charger can also be used, however it is important to adhere to the termination criteria mentioned below to minimize the chance of excessive over-charge. Bulk stage - the charger should deliver the initial current I1 until the voltage limit U0 is reached. Absorption stage - the charger should maintain the voltage U until the current tapers to I2. You can learn more about what kind of cookies we use, why, and how from our Privacy Policy.
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I would recommend a high amperage charge (25-35 amps) to try to restore the voltage level, and then run a test on the battery to see if it is still good. Does anyone know what the spec is for our alternator's voltage output at the battery terminals?
A car alternator can recharge both wet cell (Panasonic battery that came with 4Runner) and AGM batteries.

However, a car alternator is not like a smart charger that you use at home and the biggest difference between the two is the length of time it takes to achieve the best charge to replace what has been drained out of the battery. So a car alternator absolutely can recharge an AGM battery given enough drive time to replenish the amps. With any battery, strive to avoid going below a 80% charge state and never leave a deeply discharged battery sitting. I have had a Sears DieHard Platinum as my starting battery for about 3 years and it is always in a great state of charge. My DieHard only runs whatever is in the truck and the biggest draw (although brief) is the starter. Note that a car alternator is only workiing when the engine is running and that the amps and voltage out are affected by engine RPM. In that chart a battery is considered fully charged around 12.6 volts but the best method of charging a depleted battery in a short time involves specific phases and controlling the amount of current and voltage. From what I have seen in my 4Runner the alternator tries to approximate the first two phases.
There's a possibility that the battery won't hold a full charge, and needs to be replaced - but you'll need to try to bump the voltage on it to get accurate results. It turns out that the charge profile from an alternator is not ideal for replenishing large battery capacity drains in a short period of time. A home charger will give you a very reliable charge in a shorter time and given how expensive the AGM batteries are it is a good idea to protect your investment. What it boils down to is: how many amp-hours did you drain from the battery and how much driving time was there to put the amp hours back in? This is why the Optima battery folks like to say that an alternator is mainly good for maintaining a battery's state of charge.
A good charger does not need much more than 12 amps to handle an AGM battery so a 130 AMP alternator is overkill for battery charging but is sized that way to simultaneously charge the battery and supply current on demand for the whole car.

I looked at the Odyssey web site and their suggested charging approach mirrors what I have pasted. A car alternator is not designed to exactly follow these patterns that a smart charger employs. Current is sent to batteries at the maximum safe rate they will accept until voltage rises to near (80-90%) full charge level.
Voltage remains constant and current gradually tapers off as internal resistance increases during charging. Just note that the Freshdesk service is pretty big on some cookies (we love the choco-chip ones), and some portions of Freshdesk may not work properly if you disable cookies. Longer drive times can accomplish it but otherwise putting a smart charger on the battery at home will take better care of the battery.
Can the voltage regulator output from the alternator be modified, I wonder, without damaging anything. Batteries are an important subject and we if we can all cite sources and facts we can have a great discussion and help each other out. If you want a no-fuss charging method you would go with an external AGM capable battery charger. This is often referred to as a maintenance or trickle charge, since it's main purpose is to keep an already charged battery from discharging.

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